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Davy lamp
The wikipedia entry about the Davy lamp.
falls over
Something that falls over topples and ends up lying on the ground.
Example: He leaned back on the chair too far and it fell over.
make use of
use something for your advantage
Example: You should make use of our language library.
Click here for more idioms and common expressions.
principle
There are two spellings of the word pronounced 'principle'. Follow the link to find out more.
more information: principal & principle
blow it out
To blow something out is to extinguish it with a puff of air.
Example: I think you should blow out the candles.
For more meanings of the phrasal verb blow out, follow the link below to our language library.
more information: blow out